Pattern lifter for molding flasks



Nov. 4, 1941. e. F. ERICKSON PATTERN LIFTER FOR MOLDING FLASKS Filed April 4, 1940 2 Sheets-Sheet l Garfiz/o F {Nb/r500 I g/--"' INVENTOR ATTO NEY I l 3 /1 0 I nb L 6 5 Nov. 4, 1941- G. F. ERICKSQN PATTERN LIFTER FOR MOLDING FLASKS Filed April 4, 1940 2 Sheets-Sheet 2 INVENTOR Ell g ATT NEY Patented Nov. 4, 1941 UNITED STATES PATENT OFFICE 2,261,647 PATTERN LIFTER FOR MOLDING FLASKS I Garfic ldF. Erickson, Tulsa, Okla. Application April 4, 1940, Serial No. 327,875

2 Glaims.

. The invention relates to molding flasks and has for its object to provide means whereby the cope or match plate of the flask may be simultaneously raised from the lower drag section and maintained in parallel relation to the lower drag section during the raising operation, thereby obviating wiggling of the parts in relation to each other and consequent damage to the sand forma tion, now the commondifficulty experienced with flasks which are manually opened.

A further object is to provide a cope or matching plate lifter which will simultaneously raise the cope or match plate at the four corners thereof and maintain the parallelism of the partsduring the raising operation.

A further object is to so construct andv mount the lifting mechanism on a snap type flask sosaidflask sections can be opened without interference from the liting mechanism- Also to mount the lifting mechanism and so. construct the same it can be easily transferred from. one flask to another flask or vice versa.

A further object is to mount the lifting mechanism on the lower drag section or the cope, or on both.

A further object is to provide a flask lifting mechanism comprising rock shafts at opposite sides of the flask and controlling upwardly and downwardly movable lifting shafts, ends of said rock shafts having arms provided with link connections with a rotatable operating handle and the link connections with hinged sections, the

hinging points of which are adapted to register with the axis of the hinges of the snap flask when the flask is closed, so said flask can be opened without removing or disconnecting the link connection.

A further object is to provide link connections between arms carried by the rock shafts and the vertically movable lifting pins.

With the above and other objects in view the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawings, described and claimed, it being understood that changes in the precise embodiment of the invention may be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawings:

Figure 1 is a perspective view of a conventional form of snap flask showing the match plate in position and the lifting mechanism in inoperative position.

Figure 2 is a side elevation of the snap flask shown in Figure 1, but showing the lifting mechanism in operated position and the match plate and cope raised.

Figure 3 is a top. plan view of one corner of the lower drag section, showing a portion of the lifting mechanism in top plan view. 1

Figure 4 is a vertical transverse sectional view through one end of the flask showing the match plate and cope raised.

Figure 5 is a vertical transverse sectional view through one end of a separable flask, showing lifting mechanism whereby the cope can be raised independently of the match plate, or the match plate and upper section raised if desired.

Figure 6 is a vertical transverse sectional View through one end of a conventional form of separable flask, showing the cope raised and the match plate eliminated.

Figure 7 is a detail perspective view of one end of the drag section, showing the lifting mecha nism bracket in position to be applied thereto.

Figure 8 is a vertical transverse sectional view through one end of the flask section as shown in Figure '7 and the bracket, showing the bracket applied thereto in full lines, and in dotted lines the brackets initial position in applying the same.

Figure 9 is a detail perspective view of the bracket holding bolt.

Figure 10 is a view in elevation of the holding bolt plate and a portion of the end of the flask section.

Referring t the drawings, the numeral l designates the drag section, 2 the cope section and 3 a match plate of conventional construction. The match plate 3 is provided with conventional dowel holes in which are received dowel pins 4 carried by the drag. Brackets 5a are carried by the ends of the cope section and through which the dowel pins also extend. The flask shown in Figures 1 to 4" inclusive is of the snap type wherein rectangular shaped walls are hingedly connected at.

5 and are snapped together at 6 in the usual manner. Snap flasks of this character are hingedly opened from around the sand therein.'

' At the present time'it is general practice to lift the cope section and match plate manually;-

however in doing so the molder can not at all times maintain the parts in a horizontal plane ing the raising operation. To accomplish this result the ends of the drag section I are provided with plates 1, detachably connected to the end walls 8 of the drag I by headed lugs 9 which are passed through the enlarged portions ii! in the plates I and moved into the restricted portions ll of the enlarged apertures l 0. When the plates 1 are initially placed in position the lugs I2 of the locking bolt l3 are in vertical position and received through the vertically elongated aperture M in the securing plate I5 carried by the end walls 8. As the plates I are forced downwardly the circumferentially arranged shoulders IS, on the bolts I3, move into the enlarged portions I'l intermediate the ends of the vertically elongated aperture [4, hence it will be seen that when the bolts l3 are rotated ninety degrees the shoulders l6 will positively hold the plates in lowered position, and at the same time the arms l2 will move onto the bevelled shoulders l8 carried by the inner side of the plate I5. This action will draw the plate 1 against the end walls 8, and at the same time the plates may be easily and quickly removed from position, the purpose of which will presently appear.

The ends of the plates 1 are provided with outwardly extending lugs IS in which are rockably mounted rock shafts 20. The rock shafts 20, between the lugs l9, are provided with inwardly extending arms 2| having link connections 22 to vertically movable lifting pins 23, which extend upwardly through vertical bearings 24 in lugs 25 carried by the ends of the plates, and are adapted to engage simultaneously the corners of the match plate for raising the four corners simultaneously upon the rocking of the shaft in one direction, thereby maintaining its parallelism during the lifting operation. One of the ends of each rock shaft is provided with an upwardly extending arm 26, and to the upper end of one of said arms is hingedly connected at 21 a right angularly shaped member 28 having a pivotal connection at 29 on the axis of the hinging points 5 of the snap flask to an angularly disposed arm 30 carried by the connecting rod 3|, which connecting rod is pivotally connected at 32 to a rotatable disc 33 carried by the side of the lower flask l. The other arm 26 has connected thereto a connecting rod 34 which is in turn pivotally connected to the rotatable disc 33 at 35 on the opposite side from the pivotal point 32. Disc 33 is provided with a handle 36adapted to be grasped by the operator for moving the lifting device from inoperative to operative position as shown in Figures 1 and 2. Disc 33 is connected to the side of the drag section by a removal bolt 31, similar to that shown in Figures 8, 9- and 10, therefore it will be seen that the lifting mechanism may be easily and quickly removed from one flask and placed on another when desired, for instance a plain type of flask as shown in Figures 6. and 7. By providing the hinging point 29 on the axis of the hinges 5 of the snap type of flask, it will be seen the flask can be easily and quickly opened when in closed condition, as shown in dotted lines in Figure 3.

If desired, the lifting mechanism may be applied to any form of separable flask. In Figure 5 lifting mechanism is shown applied to the cope and to the drag section, however the operation of each mechanism is the same as shown in Figures 1 and 2.

From the above it will be seen that a lifting mechanism is provided for molding flasks which is simple in construction, the parts reduced to a minimum; one which will allow the opening of a snap type of flask and the mechanism so mounted that it may be easily and quickly removed from one flask and placed on another.

The invention having been set forth what is claimed as new and useful is:

l. The combination with a flask comprising a drag and a cope, of lifting mechanism for the cope carried by the drag, said lifting mechanism comprising brackets carried by opposite Walls of the drag, rock shafts in said brackets, inwardly extending arms carried by said rock shafts, vertical lift pins carried by said brackets and adapted to raise the cope, link connections between said pins and the inwardly extending arms, a rotatable member carried by the side of the drag, arms carried by ends of the rock shafts, connecting rods connecting said last named arms and the rotatable member, said brackets being mounted on headed members carried by the drag and received through enlarged apertures in the brackets and moved into restricted portions of the apertures upon downward movement thereof, a rotatable lock bolt carried by each bracket and having opposite extending arms receivable in a vertical. slot in the drag and adapted to be rotated for drawing the brackets towards the drag, said bolts having shoulders receivable in enlarged portions of the vertical slots when the brackets are in loweredposition and the headed members in the restricted portions of the enlarged apertures in the brackets.

2. The combination with a flask comprising a cope member and a drag member, said cope and drag being in superimposed relation, one of said members having angularly disposed sides hingedly connected, of a lifting mechanism for one of said members and carried by opposite sides of one of the members having angularly hinged sides, said lifting mechanism comprising rock shafts, arms carried by said rock shafts, connecting rods carried by said arms and extending towards each other, means for forcing said rods towards and away from each other, one of said rods being formed from two sections, rigid inwardly extending arms carried by said rod sections, said inwardly extending arms being hingedly connected on the axis of the hinged connection of the angularly disposed sides, whereby the member on which the lifting mechanism is :dis-v posed may be hingedly opened without interference from the lifting mechanism.

GARFIELD F. ERICKSON. 

